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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4be7c855895e5e2953aed60a475bdd5c459cb24afdfea29ddde98a3bcca9b011' 
  AND token = 'WBR+EjkPD8uUNC0ybqI9whMud6S6o5e/JR6k8a1CMNM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}